720889605 has 32 divisors (see below), whose sum is σ = 1282715520. Its totient is φ = 384134400.

The previous prime is 720889577. The next prime is 720889613. The reversal of 720889605 is 506988027.

It is not a de Polignac number, because 720889605 - 2⁶ = 720889541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251430 + ... + 254280.

It is an arithmetic number, because the mean of its divisors is an integer number (40084860).

Almost surely, 2^720889605 is an apocalyptic number.

It is an amenable number.

720889605 is a deficient number, since it is larger than the sum of its proper divisors (561825915).

720889605 is a wasteful number, since it uses less digits than its factorization.

720889605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4738 (or 4732 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 720889605 is about 26849.3874231797. The cubic root of 720889605 is about 896.6499344286.

The spelling of 720889605 in words is "seven hundred twenty million, eight hundred eighty-nine thousand, six hundred five".